Internal-combustion engine



Dec. 4, 1928. v I 1,693,832

J. G. VINCENT I INTERNAL COMBUSTION ENGINE Filed April 18. 1 2 3 Sheets-Sheet l I I INVENTOR: BY awe (i fint'eni A TTORNE Y.

J. G. VINCENT INTERNAL COMBUSTION ENGINE Dec. 4, 1928.

\m a V3 MI 2 z n n.. 1/1/1144 Bea ,1928.

J. G. VINCENT INTERNAL COMBUSTION ENGINE I N VE NTOR.

ATTORNEY.

i! n 6 t C w .W h t V fi m 6 I Z W r S 1 7 l1 m i 4 .I H Y 1/ m m E B .9 1 cm 1 a. 1 1 a f a 1 I n a .l 3.1! w M E M IAIVIIIQVV g g Q. i k I T F l T l Patented Dec. 4, 1928.

UNITED STATES PATENT OFFICE.

JESSE G. VINCENT, OF DETROIT, IICHIGAN, ASSIGNOR TO PACKARD MOTOR CAR COM- PANY, OF DETROIT, MICHIGAN,

4 CORPORATION OF MICHIGAN.

INTERNAL-COMBUSTION ENGINE.

Application and Apr-11.18,

- and valve operating mechanism. The particular engine chosen to illustrate an embodiment of the invention is an air lane engine having steel cylinders and weldizd-on water jackets, but the application of the invention is not necessarily limited to this engine construction.

One of theobjects of the invention is to provide a light but rigid and lasting valve operating mechanism for an internal combustion engine.

Another object. is to provide a double armed rock shaft for simultaneously 0 erating two of the motor valves and a sing e op erating arm for said shaft arranged between its ends.

Another object is to provide an engine having two exhaust ports and elbows with valve operating means mounted above said elbows and having its operatin rod extendingdownwardly between said e we.

Another objectis to provide an operating rod for rocker levers having a reinforced fer-. rule at its tip adapted to-engage by line contact with an adjustable tappet carried by the rocker arm.

The above and other objects of my inventionwill be apparent from the following description wherein reference is made to the accompanying drawin s illustrating a preferred embodiment o my invention, and wherein similar reference numerals designate similar parts throughout the several views. j 1

In the drawings Fig. l is a front elevation of one of the cylinders of an airplane engine equipped with my improved valve operating mecha-, nism, parts heing'broken away and shownin section; 3

Fig. 2 is an enlarged-detail view of the. rocker lever and associated parts;

Fig. 3 is a detail plan view of the rocker levl "1" j Fig 4 is a detail sectional view showing the mounting of the rocker lever;

Fig. 5 is a sectional view taken substantially on the line 5-5 of Fi 3; i

Fig. 6 is an enlarged section on the lined-6 of Fig. 5; g

Fig. I isa perspective view of one of the tappet bolts;

being provided at the ends 1922. Serial no.'555,o54;

, Fig. 8 is a horizontal sectional view substantially on the'line 88 of Fig. 2; and

Fig. 9 is a section on the line 99 of Fig. 8. Referring to the drawings, the numeral 5 designates a cylinder of an airplane or other internal combustion engine water jacketed as at 40 and having a piston 6 and provided with inlet and exhaust elbows 7. Each cylinder 5 is preferably provided with a plurality of inlets and exhausts to permit the introduction of a full charge and the more rapid and complete scavenging of the burnt gases. The

inlet and exhaust ports in the elbows are elbows and terminating at their upper ends in flat hardened tips adapted to be engaged by inwardly extending arms 12 of rocker levers 13. A spring 14 mounted between discs 8 respectively carried by the valve stem 10 and guide sleeve 11 tends to normally hold the valve 9 firmly againstits seat and controlled by valves 9 having stems 10 passmg through guide sleeves 11 secured in the to return the valve to its seat whenever the pressure of the rocker arm 12 is removed (see Fig. 2). A

Each of the elbows 7 is secured as by welds mg to the cylinder head' and jacket and they extend in pairs at each side of the cylinder. Thus In Figs. 8 and 9 the elbows are shown as extending beyond the jacket 40 and in communication with branches of an inlet or exhaust pipe 41. The connection is made between the elbow and branches b bolts 42 extending into brackets 17 welde or otherwise secured on the extensions of the elbows.

There is a rocker lever 13 for each pair of valves'and as herein shown each is provided with a pair of valve-engaging arms 12 arranged adjacent the ends of an elongated fulcrum portion 4-3 adapted to provide an extended area in engagement with anti-friction.

rollers 15 encirclinga pin 16 mounted at its opposite ends in upward extensions of the I supporting brackets 17 (see Figs. 4' and 9).

Each end of the pin 16 is secured in the a split upper end of its respective supporting bracket y clamping bolts 44. A. grease cup 18 maybe mounted in the fulcrum portion 43 of the rocker lever 13 to provide lubrication for the bearings 15, suitable guard. discs 19 of the fulcrum portion to prevent leakage of the iubricant.

Mounted substantially centrally of the fulerurn portion 43 of the rocker lever is an operating arm 20 adapted to extend in the opposite direction fromthe valve-engaging arms 12 and be engaged by a vertical operating rod 21. The operating rod 21 is preferably constructed as ahollow tube having a hardened metal ferrule 22 welded or otherwise secured upon its opposite ends, the lower ferrule resting within the upwardly extending cup 23 adj ustably mounted at the upper end of the thrust rod 24, the lower extremity of which carries a roller 25 riding upon the pe' operating rod 21 is Tat apted to engage the lower face of a tappet bolt 28 mounted in-the operating arm 20, a guide cup 29 being preferably arranged under the head of the tappet substantially as shown in Fig. 2 to prevent accidental dislocation of the operatin rod from its tappet. The tappet 28 is pre erably formed with -a 'rounded bodyportion having its periphery flattened at one or more points, as at 30, and fits within an aperture 31 in the operating arm 20, having one or more straight sides adaptedto cooperate with the flattened portions of the tappet to prevent its rotation (see Figs. 5, '6 and 7). The head of the tappet 28 is provided with a cylindrically rounded lower .face 32 3 adapted to engage by line contact with the upper flat surface of the ferrule 22 of the operatin rod. By virtue of this construction the ead of the operating rod rocks with little or no wear on the tappet 28 of the rocker arm at all positions of the rocker lever. A nut 33 is threaded upon the upper extremity of the tappet 28 and bears against the upper surface of the rocker arm 20, to secure the tappet 28 and guide cup-29 to the arm. i

A similar tappet 28 but without the cup,-

' is mounted in each of the valve-operating arms 12 of the rocker levers with their cylindrical head portions 32 engaging by line contact with the fiat tip of the valve stems 10 (see Fig.2). X i

The operation of my improved valve-operating mechanism is believed to be apparent. As the crank shaft of the engine is rotated the valve operating shafts 27 are rotated to bring the cams 26 thereof into position to raise the o erating rods 21 of the inlet and exhaust Va ves, the cams 26 being properly positioned upon the shafts 27 to oscillate the rocker levers 13 at the desired times. The upward movement of the operating rods 21 will swin upwardly the operating arm 20 of the rec er lever 13, causing a simultaneous downward swinging mover-ant of both the valve-engaging arms 12 of the rocker lever to open the valves 9 against the tension of their springs 14. The valves 9 are thus held 'open until the cams 26 have revolved sufliciently to 'allow the operating rods 21 'to drop to their normal positions,whereupon the springs 14 will return the valves to closed positions and swing upwardly the valve-ena in arms 12 of the rocker lever with conb g a throughout their entire movement.

Whileit will be apparent that the illustrated embodiment of my invention herein disclosed is well calculated to adequately fulfill the objects and advanta es primarily stated, itis to be understood t at the invention is susceptible towariation, modification and change within the spirit and scope of the subjoined claims.

Having thus described my invention, what I claim and desire to secure by Letters Pat- .theopposite direction from t e valve-engagingarms.

2. In an engine,a cylinder having a plurality of ports therein, valves arranged to normally close said ports, a rocker lever arranged to simultaneously open and close said valves having a plurality of spaced parallel valve-engaging arms-normal thereto and an operating arm arranged centrally of the valve-engaging arms and extending in the opposite direction.

3. In an engine, a cylinder having a plurality of ports therein, valves arranged to normallyclose said ports, a rocker lever arranged to simultaneously open and close said valves comprising an elongated fulcrum portion, a plurality of spaced valve-engaging arms, normal tov the ends of the fulcrum portion an operating arm arranged centrally of the valve-engaging arms, and an operating rod engaging by line contact with said operating arm.

4. In an engine, a cylinder having aplurality of ports therein, valves arranged to normally close said ports, a rocker lever arranged to simultaneously open and close said valves and formed with a plurality of spaced valve-engaging arms and'an operating arm and having an arcuate face, an operating rod der having a pair of valves and having a hardened ferrule secured at its upper extremity and engaging by line contact with the areuate face-of said tappet, and a guide cup carried by the operating arm and encircling-the operating ro' 5. A valve-operating rocker lever for engines having. an elongated fulcrum portion, a plurality of spaced valve-engaging arms normal to the fulcrum portion, and a single operating arm normal to the fulcrum portion and centrally between the valve-engaging arms.

6. In an engine, in combination, a cylinsubstantially parallel conduits extending laterally from said valves, supports upon the alls of said conduits, a rocker lever mounted on said supports, arms on said lever to operate said valves, and an operating rod extending up- I wardly between said'conduits for moving said rocker lever.

' 7. In an engine, in combination, a cylinder having a pair of valves and substantially parallel conduitsextending laterally from said valves, a rocker lever supported from said conduits having arms for operating said wardly between said con its for moving said valves, and an operating rod extendinguprocker lever.

8. A valve operating mechanism comprising an operating arm, a tappet therein having an arcuate face and secured against turn- 1ng 1n the arm, a cup secured to said arm by said tappet, and an operating rod extending into said cup in contact with said face.

9. In anengine, a cylinder having a plurality of laterally projecting conduits, a connection for each of said conduits, separated supporting arms extendingfrom said connections, a valve rocker lever supported by said arms, and means for operating the lever.

10. In an engine, a cylinder having'a plurality of laterally projecting conduits, a bracket at the end of each of said conduits, separated supporting arms'extending from said brackets, a valve rocker lever having a pivot pin clamped to said arms, and means for operating said lever.

11. A valve operating mechanism comprising an operating arm, a tappet mounted in the arm, means to prevent turning of the tappet in the-arm and an enlarged head upon thetappet having an arcuate face, a cup in cup being mounted upon the shank of the tappet-between the head thereof and the operating arm, and an operating rod extending into the cup and engaging the arcuate face.

In testimony whereof I affix my signature.

JESSE G. VINCENT.

which the head'of the tappetisseated, the 

